I recently saw a live demonstration of a 1000 milli watt hand held, battery
powered laser. It could burn paper 3 feet away and light a match.

If you shined it on a rotor nothing would happen as the heat of the
laser spot would be dissipated in the mass of the metal rotor.

However if there were tiny conical metal mountains in the bath tub that lined up
with the lasers  at 22 degrees BTDC that might act like three spark plugs. For a wide rotor one
could have three of these lasers side by side at the trailing spark plug
location. The timing would be fixed of course so that might work best
in something like an aircraft engine.

The advantage is the hole for the laser could be very very small. Much
smaller than the trailing spark plug hole is now. The trialling spark plug
hole bypasses some compression pressure.

Apparently surface mount spark plugs do not work or Mazda would be
using them.

http://www.laserpointerpro.com/attribute/power_1000mw-lasers_26

As you can see from these pressure plots there is considerable pressure
differences across the trailing spark plug hole. Where there are pressure
differences there is gas flow. It is best to keep the trailing spark plug
hole as small as possible.


The temperature of the rotor housing is more evidence the fire is getting
blown down stream by the squish flow. That could mean the center of pressure
is not on the rotor geographical center.

Paul Lamar


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